Mortising-machine



2 t e e h QM m e e h s 3 w m I w .A T...M G m H m M W (No Model.)

Patented Aug. 7, 1894.

WIZW'ESSES.

t l I MW Mm ns PEYERS 00.. PHOTO-L this specification.

UNITED I STATES PAT NT OFFICE.-

WILLIAM H. CLARK AND WILLIAM J. CLARK, OF SALEM, OHIO.

MORTISING-MACHINE.

SPECIFICATION swa part of Letters Patent No. 524,192, dated August 7,1894.

pp i filed February 27.1894. Serial No. 501,705; (No model.)

To aZZ whom it may concern.-

Be it known that we, WILLIAM H. CLARK and WILLIAM J. CLARK, bothresidents of Salem, in the county of Columbiana and State of Ohio, haveinvented certain new and usefulImprovements in Mortising-Machines; andwe do hereby declare that the following is afull, clear, and exactdescription of the invention, which 'will. enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, which form a part of Our invention relatesto improvements in mortising machines of that class or descriptronin-which a pair of vertically reciprocatlng chisels are employed, whichare automatically spread apart while making a mortise and contractedwhen the mortise-is complete.

The object of the presentinvention, is'to provlde an improved meanswhereby the spread of the chisels may be regulated instantaneously atthe will of the operator without stopping the machine, to producemortises of varying lengths.

The invention consists in the novel construction and combination ofparts, as will be hereinafter more fully described and claimed.

In the accompanying drawings: Figure 1 1s aside view of a mortising'machine with our Improvements applied thereto. Fig. 2 is a front view ofthe same. Fig. 3 is a detail elevation. Fig.4 is a detail sectionalview.

In the said drawings, the reference numeral 1 designates the frame whichsupports the working parts of the machine; 2 the bed or table upon whichthe work to be operated upon is secured. 3, 3, designate the chiselbars, in the lower ends of which, the chisels, (not shown) are inserted.

The numerals 4, 4, designate the chisel bar bed plates hung upon pivots5, on the front of the machine, and provided with suitable hearings inwhich the chisel bars reciprocate.

The numeral 7 denotes the drive-shaft journaled in the top of theframeand provided with a drive-pulley 8, and double cranks 9, 9,

with which the chisel bars are secured by' means of connecting rods 10,10. v

In the lower part of the frame is journaled a cam-shaft- 12, providedwith a cam 13, for" raising and lowering the table, which works insuitable vertical guides.

The numeral 14 designates a bell-crank 1ever, fulcrumed at 15, to anyconvenient part of the frame, and provided at its lower end with an arm16. Adjustablysecured, to the other end of said lever is a connectingrod 17, also adjustably connected at its upper end with a lever 18,which is fulcrumed upon the shaft or pivot-pin 19. v

The numeral designates a cross-bar selevers pivotally secured to theends of the cross-bar 2O and"engaging with the lower ends of the chiselbar bed-plates, respectsaid plates.

Motion is conveyed from the drive-shaft to the shaft 12 by means of asuitable -drive connection. V

The parts so far described, form no part of our present invention andare not claimed, except in combination with our improvements.

Carried by the shaft 12, is a slidable crank 32, having a groove inwhich fitsa feather 34, on said shaft for the purpose of causing saidcrank to rotate therewith. Journaledon a pin 34*, is a step roller 35,formed by cutting away the periphery thereof. Connected with the crank32 is a yoke 36, connected bya bar 37 with one arm of a bell-crank lever38, pivoted to the machine frame. The'other arm of this lever isconnected by a rod or bar 39 with a two-armed lever 40 fulcrumedin lugs.1 secured to the machine frame. arm of this lever is connected wit-h anoperating handle 42, provided with notches 43 adapted to engage with astud on a vertical bar 44, whereby said parts are held in position.

, In operation, as the chisel bars arerecipr'ocated up and down, thestep-roller on the crank will engage with and actuate thearm 16 of thelever 14, and by means of the connections spread the chisels apart whilemaking a mortise. As the said roller is .disengaged from the arm by themovement of the crank, the chisels will contract. This latter movementshould commence just as the chisels have'completed the mortise. When itis The long desired to vary the spread of the chisels to cured to thepivot-pin 21, and 23 are elbow ively, thereby controlling the spreadingof incidence with the arm 16 of lever 14. It is obvious that when thelargest diameter of the said step-roller engages with said arm thechisels will be spread farther apart than when a smaller diameter orstep engages therewith.

The crank can be shifted without stopping the machine, whereby the usuallabor and delay in the machines in use are avoided.

It is obvious that instead of a single steproller being employed, two ormore rollers of different diameters may be used instead. It is alsoobvious that the lever 14 may be made slidable (instead of the crank 32)upon its fulcrum 15, the latter being lengthened to suit that purpose,and the shifting device 36, 37, 38, 39, 40, 41, 42, 43, and 44 modifiedto connect therewith, and in which case the chisel spreading connections17 and 18 would also be modified to permit this sliding motion of thelever l4. It is also obvious that a plain single roller may be employed,and the, steps be formed on the arm of the bell-crank lever with whichit engages without departing from the spirit of our invention. It isalso obvious that when a plain single roller is employed the arm 16 maybe hinged upon the lever 14 and a wedge, cam or other suitable deviceconnected therewith to project or retract the arm 16, and according asthe arm 16 is thus projected or retracted, the motion of the lever 14(and its chisel spreading connections) will vary when the arm 16 engageswith and is actuated by the roller of the crank 32. In this case,neither the crank 32 nor the lever 14 is slidable.

Having thus described our invention, what we claim is 1. In a mortisingmachine of the character described, the combination with the slidablecrank carried thereby, and means substantially as specified for varyingthe spread of the chisels by the shifting of said crank.

2. In a mortising machine of the character described, the combinationwith the shaft, the slidable crank carried thereby, provided with astep-roller, the bell-crank'lever with which said roller is adapted toengage, and means for spreading the chisels apart by the movement ofsaid lever, substantially as and for the purpose set forth.

3. In a mortising machine of the character described, the combinationwith the shaft, the slidable crank carried thereby, the yoke connectedtherewith, the connecting rods and levers for shifting said crank, thestep-roller carried by the crank, the bell-crank lever with which saidroller engages and the connections for spreading the chisels apart bythe movement of said lever, substantially as described.

In testimony that we claim the foregoing as our own we have hereuntoaffixed our signatures in presence of two witnesses.

WILLIAM H. CLARK. WILLIAM J. CLARK.

Witnesses:

J. FAUCETT, C. TOWNSEND.

